Under Edit there are three items. They
Set Current Surface, and
- Surface Type allows a user to
specify the surface type that will be used for creating the
next surface. This system supports four types of surfaces:
- Bézier Surface
selects the surface to be a Bézier surface.
- Rational Bézier
Surface selects the surface to be a rational
- B-spline Surface
selects the surface to be a B-spline surface.
- NURBS Surface
selects the surface to be a NURBS surface.
- Set Current Surface lets a
user to pick a surface to be the current surface. The IDs of
all surfaces on the drawing canvas are listed. Thus, selecting a
surface ID will make the corresponding surface the current one.
- Implicit Surface is designed
for processing implicit surfaces. It has the following